GMC G1500 Differential Ring and Pinion Replacement

Rear; GM 8.875 in.; 12 Cover Bolts; 12 Ring Gear Bolts; 30 Axle Spline; 30 Pinion Spline; Standard Rotation

Rear; GM 8.5 in.; 10 Cover Bolts; 10 Ring Gear Bolts; 28/30 Axle Spline; 30 Pinion Spline; Standard Rotation; w/ Eaton Posi/Truetrac

GM 10.50 in.; 14 Cover Bolts; 12 Ring Gear Bolts; 30 Axle Spline; 30 Pinion Spline; Standard Rotation Replaces Conventional Diff. Internals In Certain 1973 Thru Present GM Axles~If Installed In GM Axle Equiped w/Optional Eaton Diff. Will Require~New Gear Support Case Assembly GM PN[6258336 Or 6258340] Depending On Ratio

10 Bolt with 5.13 Gear Ratio with GM 8.5 & 8.6 Axles

10 Bolt with 2.73 Gear Ratio with GM 8.5 & 8.6 Axles

10 Bolt with 5.38 Gear Ratio with GM 8.5 & 8.6 Axles

GM 10.50 in.; 14 Cover Bolts; 12 Ring Gear Bolts; 30 Axle Spline; 30 Pinion Spline; Standard Rotation; Cover Gasket Not Included Replaces Conventional Diff. Internals In Certain 1973 Thru Present GM Axles~If Installed In GM Axle Equiped w/Optional Eaton Diff. Will Require~New Gear Support Case Assembly GM PN[6258336 Or 6258340] Depending On Ratio

12 Bolt with 3.42 Gear Ratio with GM 8.875 Axle

12 Bolt with 4.11 Gear Ratio with GM 8.875 Axle

12 Bolt with 4.56 Gear Ratio with GM 8.875 Axle

12 Bolt Case Split 3.42 And Down with 3.73 Gear Ratio with GM 8.875 Axle with Thick Gear

For GM 8.5"/8.625" (10 Bolt); A-Line Ring and Pinion; 3.08 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.5 In. Ring Gear w/3.42 Axle Ratio

For GM 8.875" (12 Bolt); A-Line Ring and Pinion; 3.73 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

12 Bolt Case Split 3.42 And Down with 4.11 Gear Ratio with GM 8.875 Axle with Thick Gears

14 Bolt Case Split 4.10 And Down with 4.88 Gear Ratio with GM 10.5 Axle with Thick Gear

For GM 8.875" (12 Bolt); A-Line Ring and Pinion; 4.11 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

8.5 In. Ring Gear w/3.73 Axle Ratio

For GM 8.5"/8.625" (10 Bolt); 3.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); A-Line Ring and Pinion; 3.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); A-Line Ring and Pinion; 3.42 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

10 Bolt with 3.23 Gear Ratio with GM 8.5 & 8.6 Axles

10 Bolt with 4.88 Gear Ratio with GM 8.5 & 8.6 Axles

For GM 8.5"/8.625" (10 Bolt); 4.11 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.875" (12 Bolt); 3.73 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); A-Line Ring and Pinion; 4.56 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

14 Bolt Case Split 4.10 And Down with 5.38 Gear Ratio with GM 10.5 Axle with Thick Gear

For GM 8.5"/8.625" (10 Bolt); 3.42 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

14 Bolt with 4.11 Gear Ratio with GM 10.5 Axle

For GM 8.5"/8.625" (10 Bolt); A-Line Ring and Pinion; 4.11 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

14 Bolt Case Split 4.10 And Down with 5.13 Gear Ratio with GM 10.5 Axle with Thick Gear

14 Bolt Case Split 4.10 And Down with 4.56 Gear Ratio with GM 10.5 Axle with Thick Gear

For GM 8.5"/8.625" (10 Bolt); 4.56 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.875" (12 Bolt); A-Line Ring and Pinion; 4.56 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

14 Bolt with 3.21 Gear Ratio with GM 10.5 Axle

8.5 In. Ring Gear w/2.73 Axle Ratio

For GM 8.875" (12 Bolt); 3.08 Ratio; Requires a 2.76 to 3.42 Ratio Carrier

For GM 8.875" (12 Bolt); 4.11 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

10 Bolt with 3.73 Gear Ratio with GM 8.5 & 8.6 Axles

8.5 In. Ring Gear w/3.23 Axle Ratio

For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 4.88 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

14 Bolt with 4.56 Gear Ratio with GM 10.5 Axle

For GM 8.875" (12 Bolt); 3.42 Ratio; Requires a 2.76 to 3.42 Ratio Carrier

10 Bolt with 3.42 Gear Ratio with GM 8.5 & 8.6 Axles

For GM 8.5"/8.625" (10 Bolt); 3.08 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.875" (12 Bolt); 4.56 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier

10 Bolt with 3.90 Gear Ratio with GM 8.5 & 8.6 Axles

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 4.10 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.875" (12 Bolt); 4.11 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 3.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 2.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 3.90 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

12 Bolt with 3.08 Gear Ratio with GM 8.875 Axle

Dana 44; 4.88 Ratio; 3.73 And Down Carrier; Double Drilled Ring Gear Works w/3/8in. And 7/16in. Bolt Dana 44; 4.88 Ratio; 3.73 And Down Carrier; Double Drilled Ring Gear Works w/3/8in. And 7/16in. Bolt~Dana 44; Standard Rotation; 4.88 Ratio; Thick Ring and Pinion Set; 26 Spline Pinion; Fits 3 Series Carrier; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 3.42 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.5 In. Ring Gear w/4.10 Axle Ratio

8.5 in./8.6 in. 10 Bolt; 4.56 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 4.56 Ratio~GM 8.5 in.; 4.56 Ratio

10 Bolt; 3.23 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 3.23 Ratio~GM 8.5 in.; 3.23 Ratio

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 4.56 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.5 in./8.6 in. 10 Bolt; 4.88 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 4.88 Ratio~GM 8.5 in.; 4.88 Ratio

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 5.13 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.5 in./8.6 in. 10 Bolt; 3.42 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 3.42 Ratio~GM 8.5 in.; 3.42 Ratio

with GM 8.875 Axle with Thick Gear 12 Bolt Case Split 3.42 And Down with 4.56 Gear Ratio

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 3.08 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 2.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

GM 12 Bolt Truck; 4.88 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 4.88 Ratio; Fits 4 series 3.73 & Up Carrier

For GM 8.875" (12 Bolt); 3.08 Ratio; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

For GM 8.875" (12 Bolt); 4.11 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

For GM 8.5"/8.625" (10 Bolt); Performance Ring and Pinion; 4.30 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 4.30 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

Dana 44; 4.88 Ratio Dana 44; 4.88 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 4.88 Ratio; 26 Spline Pinion; Fits 4 Series Carrierr; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

For GM 8.875" (12 Bolt); 3.73 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

For GM 8.5"/8.625" (10 Bolt); 4.10 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.875 in. 12 Bolt; 4.11 Ratio GM 12 Bolt Truck; 4.11 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 4.11 Ratio; Fits 4 series 3.73 & Up Carrier

8.875 in. 12 Bolt; 3.07 Ratio GM 12 Bolt Truck; 3.07 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 3.07 Ratio; Fits 3 series 3.42 & Down Carrier

Dana 44; 3.73 Ratio Dana 44; 3.73 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 3.73 Ratio; 26 Spline Pinion; Fits 3 Series Carrier

Dana 44; 3.08 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 3.08 Ratio; 26 Spline Pinion; Fits 3 Series Carrier

8.875 in. 12 Bolt; 3.73 Ratio GM 12 Bolt Truck; 3.73 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 3.73 Ratio; Fits 4 series 3.73 & Up Carrier

Dana 44; 3.92 Ratio Dana 44; 3.92 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 3.92 Ratio; 26 Spline Pinion; Fits 4 Series Carrier

Dana 44; 4.56:1 Ratio; 1.375 in. Pinion; 26 Spline; 8.500 in. Ring Gear; Set Dana 44; 4.56 Ratio; 1.375 in. Pinion; 26 Spline; 8.500 in. Ring Gear; Set~Dana 44; Standard Rotation; Ring and Pinion Set; 4.56 Ratio; 26 Spline Pinion; Fits 4 Series Carrier

8.875 in. 12 Bolt; 4.56 Ratio GM 12 Bolt Truck; 4.56 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 4.56 Ratio; Fits 4 series 3.73 & Up Carrier

8.875 in. 12 Bolt; Thick; 3.73 Ratio GM 12 Bolt Truck; Thick Ring and Pinion Set; 3.73 Ratio; Fits 3 series 3.42 & Down Carrier~GM 12 Bolt Truck; Thick; 3.73 Ratio

8.875 in. 12 Bolt; Thick; 4.11 Ratio GM 12 Bolt Truck; Thick Ring and Pinion Set; 4.11 Ratio; Fits 3 series 3.42 & Down Carrier~GM 12 Bolt Truck; Thick; 4.11 Ratio

Dana 44; 4.11 Ratio; Thick Ring/Pinion; 3.73-Down Carrier Dana 44; 4.11 Ratio; Thick Ring/Pinion; 3.73-Down Carrier~Dana 44; Standard Rotation; 4.11 Ratio; Thick Ring and Pinion Set; 26 Spline Pinion; Fits 3 Series Carrier

Dana 44; 3.54 Ratio Dana 44; 3.54 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 3.54 Ratio; 26 Spline Pinion; Fits 3 Series Carrier

8.875 in. 12 Bolt; 3.42 Ratio GM 12 Bolt Truck; 3.42 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 3.42 Ratio; Fits 3 series 3.42 & Down Carrier

Dana 44; 4.11 Ratio Dana 44; 4.11 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 4.11 Ratio; 26 Spline Pinion; Fits 4 Series Carrier

8.875 in. 12 Bolt; Thick; 4.56 Ratio GM 12 Bolt Truck; Thick Ring and Pinion Set; 4.56 Ratio; Fits 3 series 3.42 & Down Carrier~GM 12 Bolt Truck; Thick; 4.56 Ratio

Dana 44; 3.31 Ratio Dana 44; 3.31 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 3.31 Ratio; 26 Spline Pinion; Fits 3 Series Carrier

For GM 8.5"/8.625" (10 Bolt); 3.73 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.875" (12 Bolt); 4.56 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

8.5 in./8.6 in. 10 Bolt; 3.73 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 3.73 Ratio~GM 8.5 in.; 3.73 Ratio

For GM 8.5"/8.625" (10 Bolt); 3.90 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 4.56 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 4.88 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 3.08 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

Dana 44; 5.89 Ratio Dana 44; 5.89 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 5.89 Ratio; 26 Spline Pinion; Fits 4 Series Carrierr; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

Dana 44; 5.13 Ratio Dana 44; 5.13 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 5.13 Ratio; 26 Spline Pinion; Fits 4 Series Carrierr; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

10.5 in. 14 Bolt; Thick; 4.88 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 4.88 Ratio; Thick Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; Thick; 4.88 Ratio

10.5 in. 14 Bolt; 3.73 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 3.73 Ratio; Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; 3.73 Ratio

10.5 in. 14 Bolt; Thick; 5.13 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 5.13 Ratio; Thick Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; Thick; 5.13 Ratio

10.5 in. 14 Bolt; Thick; 4.56 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 4.56 Ratio; Thick Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; Thick; 4.56 Ratio

10.5 in. 14 Bolt; 4.11 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 4.11 Ratio; Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; 4.11 Ratio

For GM 8.875" (12 Bolt); 3.73 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

10.5 in. 14 Bolt; Thick; 5.38 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 5.38 Ratio; Thick Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; Thick; 5.38 Ratio

For GM 8.5"/8.625" (10 Bolt); 3.42 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 5.13 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

8.5 in./8.6 in. 10 Bolt; 5.13 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 5.13 Ratio~GM 8.5 in.; 5.13 Ratio

8.5 in./8.6 in. 10 Bolt; 5.38 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 5.38 Ratio~GM 8.5 in.; 5.38 Ratio

8.5 in./8.6 in. 10 Bolt; 3.90 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 3.90 Ratio~GM 8.5 in.; 3.90 Ratio

8.875 in. 12 Bolt; 5.13 Ratio GM 12 Bolt Truck; 5.13 Ratio~GM 12 Bolt Truck; Ring and Pinion Set; 5.13 Ratio; Fits 4 series 3.73 & Up Carrier

Dana 44; 4.56:1 Ratio; 1.375 in. Pinion; 26 Spline; 8.500 in. Ring Gear; Thick; Set Dana 44; 4.56 Ratio; 1.375 in. Pinion; 26 Spline; 8.500 in. Ring Gear; Thick; Set~Dana 44; Standard Rotation; 4.56 Ratio; Thick Ring and Pinion Set; 26 Spline Pinion; Fits 3 Series Carrier; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

Dana 44; 5.38 Ratio Dana 44; 5.38 Ratio~Dana 44; Standard Rotation; Ring and Pinion Set; 5.38 Ratio; 26 Spline Pinion; Fits 4 Series Carrierr; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

For GM 8.875" (12 Bolt); 4.11 Ratio; Thick Ring Gear; Requires a 3.40 Ratio and Numerically Lower Ratio Carrier

For GM 8.5"/8.625" (10 Bolt); 3.23 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier

Dana 44; 5.13 Ratio; 3.73 And Down Carrier; Double Drilled Ring Gear Works w/3/8in. And 7/16in. Bolt Dana 44; 5.13 Ratio; 3.73 And Down Carrier; Double Drilled Ring Gear Works w/3/8in. And 7/16in. Bolt~Dana 44; Standard Rotation; 5.13 Ratio; Thick Ring and Pinion Set; 26 Spline Pinion; Fits 3 Series Carrier; Double Drilled Ring Gear for 3/8in. and 7/16in. Bolts

8.5 in./8.6 in. 10 Bolt; 4.11 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 4.10 Ratio~GM 8.5 in.; 4.11 Ratio

For GM 8.875" (12 Bolt); 5.38 Ratio; 3.73 Ratio Carrier and Higher; Requires Notched Cross Pin 80-0269-1 For Ring Gear Clearance

For GM 8.875" (12 Bolt); 4.56 Ratio; Thick Ring Gear; Requires a 2.76 to 3.42 Ratio Carrier

For GM 8.875" (12 Bolt); 4.88 Ratio; Requires a 3.73 and Numerically Higher Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

10.5 in. 14 Bolt; 4.56 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 4.56 Ratio; Ring and Pinion Set; Fits 4 series 4.56 & Up Carrier~GM 10.5 in.; 14 Bolt Cover; 4.56 Ratio

8.5 in./8.6 in. 10 Bolt; 2.76 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 2.73 Ratio~GM 8.5 in.; 2.76 Ratio

10.5 in. 14 Bolt; 3.21 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 3.21 Ratio; Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; 3.21 Ratio

10.5 in. 14 Bolt; 3.42 Ratio GM 10.5 in Rear; w/ 14 Bolt Cover; 3.42 Ratio; Ring and Pinion Set; Fits 3 series 4.10 & Down Carrier~GM 10.5 in.; 14 Bolt Cover; 3.42 Ratio

For GM 8.5"/8.625" (10 Bolt); 5.38 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier; Requires Notched Cross Pin Part# 80-0272-1

3.38 Ratio GM 55-64 1/2 Ton truck; 3.38 Ratio~GM 9.375 in. 55-64 1/2 Ton truck Rear; 3.38 Ratio; Ring and Pinion Set

For GM 8.5"/8.625" (10 Bolt); 5.57 Ratio; Requires a 2.73 and Numerically Higher Ratio Carrier; Requires Notched Cross Pin Part# 80-0272-1

For GM 8.875" (12 Bolt); 3.42 Ratio; Requires a 2.76 to 3.42 Ratio Carrier; 1963-1964 Models Require a 30 Spline Pinion Yoke

8.5 in./8.6 in. 10 Bolt; 3.08 Ratio GM 8.5 & 8.6 in.; 10 Bolt; Ring and Pinion Set; 3.08 Ratio~GM 8.5 in.; 3.08 Ratio

For GM 8.875" (12 Bolt); 5.13 Ratio; 3.73 Ratio Carrier and Higher; Requires Notched Cross Pin 80-0269-1 For Ring Gear Clearance

8.87 In. Ring Gear w/3.73 Axle Ratio